3217320643 has 2 divisors, whose sum is σ = 3217320644. Its totient is φ = 3217320642.

The previous prime is 3217320629. The next prime is 3217320653. The reversal of 3217320643 is 3460237123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3217320643 - 2⁹ = 3217320131 is a prime.

It is not a weakly prime, because it can be changed into another prime (3217320653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1608660321 + 1608660322.

It is an arithmetic number, because the mean of its divisors is an integer number (1608660322).

Almost surely, 2^3217320643 is an apocalyptic number.

3217320643 is a deficient number, since it is larger than the sum of its proper divisors (1).

3217320643 is an equidigital number, since it uses as much as digits as its factorization.

3217320643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 3217320643 is about 56721.4301917714. The cubic root of 3217320643 is about 1476.2665582712.

Adding to 3217320643 its reverse (3460237123), we get a palindrome (6677557766).

The spelling of 3217320643 in words is "three billion, two hundred seventeen million, three hundred twenty thousand, six hundred forty-three".